On the independence of $\sigma (\phi (n))$ and $\phi (\sigma (n))$

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Mohand-Ouamar Hernane, Florian Luca Acta Arithmetica 138 (2009), 337-346 MSC: 11N25, 11N36. DOI: 10.4064/aa138-4-4

Mohand-Ouamar HernaneInstitut de Mathématiques
Université Houari Boumedienne
BP 32, El Alia, 16111 Bab Ezzouar
Alger, Algeria
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Florian LucaInstituto de Matemáticas
Universidad Nacional Autónoma de México
C.P. 58089, Morelia, Michoacán, México
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